Rotary-wing vehicle system and methods patent

ABSTRACT

A rotary-wing apparatus that is aeronautically stable, easy to fly with a multidimensional control, small size, and safe to fly and low cost to produce. The rotary-wing apparatus includes a coaxial counter rotating rotor drive providing lifting power with an inherent aeronautical stability; Auxiliary propellers that face the direction of flight and are located on opposite sides of said coaxial Rotary-wing apparatus and enable flying forwards, backwards and perform yawing; A rotary-wing coaxial helicopter toy that is remotely controlled and safe to fly in doors and out doors, while performing exciting maneuvers even by untrained kids

This application is based on provisional application No. U.S. 60/624,941 filed on Nov. 5, 2004

FIELD OF THE INVENTION

The present invention relates to flying apparatuses generally and more specifically to self-stabilizing rotating flying toys.

BACKGROUND OF THE INVENTION

The following U.S. Patents are believed to represent the current state of the art: 5,252,100 October 1993 Osawa, et al. 446/44 D465,196 November 2002 Dammar D12/328 6,899,586 May 2005 Davis 446/37 6,843,699 January 2005 Davis 446/37 6,688,936 February 2004 Davis 446/37 5,971,320 October 1999 Jermyn, et al. 244/17.25 6,568,980 May 2003 Barthold 446/36 6,450,446 September 2002 Holben 244/34A 6,616,094 September 2003 Illingworth 244/12.1 D503,198 March 2005 Rehkemper, et al. D21/442 6,802,693 October 2004 Reinfeld, et al. 416/1 6,824,094 November 2004 Richard 244/11 6,568,634 May 2003 Smith 244/72 6,086,016 January 2000 Meek 244/17.11 5,297,759 March 1994 Tilbor, et al. 244/17.11 6,811,460 November 2004 Tilbor, et al. 446/34

The passion of flying has accompanied human beings from the early days of the humankind. The well-documented Helical Air Screw drawing of Leonardo Da Vinci in the fifteen-century was an important step towards a vertical take off, hovering and landing flying apparatus. It was only when a light weight powerful enough engine for powering rotating blades become available when Paul Cornu took off vertically in 1907. Vertical flights became easier and smoother when gyro control became available in mid-1940's and became common about a decade later.

A helicopter typically has two rotor blades that are connected through a drive shaft to an engine. The air deflected downwards due to the spinning of the rotor blades provides the lilting power. Rotor blades at the tail of the helicopter are directed in the horizontal plane provide the anti-torque power that is required in order to prevent helicopter from rotating due to the spinning main rotor. Changing the main rotor blades attack angle provides horizontal motion according to pilot's commands.

Sikorsky and Kamov first introduced a helicopter with two counter rotating main rotors on a common axis. Eliminating the need for tail rotor blades, the counter-rotating blades provide higher maneuverability and stability.

Flying toys history is even longer than the flying vehicles. Not like flying vehicles, flying toys are typically very prices sensitive. They should be stable, easy and safe to fly.

Consequently, Remote control flying toys should be designed to be inherently stability, with safe and durable structure and materials, using low cost components and very simple to manufacture.

SUMMARY OF THE INVENTION

The present invention provides an innovative rotary-wing apparatus that is aeronautically stable, easy to fly and control, very small in size, safe to fly and low cost to produce. In accordance with present invention a rotary-wing flying apparatus innovative design eliminates the need for gyros and motion sensors, expensive actuators and movable parts, rotor blades with changeable attacking angle, nor a tail rotor. Consequently making it possible to be produced in a very low cost, thus enabling implementations such as toys and other low cost applications. In addition it consists of innovative safety features for the operator and its surrounding making it possible to fly a rotary-wing platform of current invention even in doors.

Rotary-wing vehicle systems are well known and are being widely used for various mobile applications. Present invention diminishes at least some of the disadvantages associated with methods and solutions of very small helicopters that are designed for stability while maintaining minimal costs, a simple control, a high reliability, robustness and endurance and with no, or minimal need for tuning and adjustments.

In another embodiment of present invention, a coaxial counter rotating rotor drive is used, providing inherent aeronautical stability.

In another embodiment of present invention, a differential steering provides excellent yaw control, as well as forward/backwards control of said Rotary-wing vehicle. Said “tank-like” differential steering enables very convenient control of said maneuvers even by layman operator.

It would be appreciated that inherent design of the blades system of present invention eliminates the need of using expensive gyros, servos and pitch control means for maintaining flying stability.

In another embodiment of present invention, using flexible blades with a “rigid type” rotor head the Rotary-wing vehicle provides smooth flying characteristics.

In another embodiment of present invention, swept forward blades increase flight stability.

In another embodiment of present invention, a flying vehicle flexible structure, which absorbs the hit energy through a spring like structure of its body.

In another embodiment of present invention, a blades connection apparatus enables blades to fold back in case of encountering excessive external force. It would be appreciated that present invention enables exchanging of the blades without screws, or the need for tools.

In another embodiment of present invention, blades tuning means, which enables collective pitch tuning of a set of rotors using a single button. It would be appreciated that single knob adjustment enables even laypeople to intuitively adjust blades in case a yaw adjusting is needed for holding rotary-wing flying apparatus direction while hovering or while flying and when no yaw control is externally provided by.

It would be appreciated that rotary-wing flying apparatus of present invention may be remotely control by an operator.

Yet another embodiment of present invention, a manual adjustment of forward/backwards motion while in steady-state. A single button adjusts center of gravity of rotary-wing flying apparatus set preferred forward motion immediately after takeoff. It would also be-appreciated that center of gravity may be adjusted for forward motion without applying power to auxiliary differential power propellers, so rotary-wing can fly forward in its steady state while saving energy, increasing flight time. Alternatively center of gravity of rotary-wing flying apparatus may be set for hovering in steady state and while no power is provided to said auxiliary differential power propellers.

Yet another embodiment of present invention, air breaks for stabilizing rotary-wing flying apparatus in a forward flight.

Yet another embodiment of present invention, a tail fin for improved yaw stabilization.

Focusing on cost sensitive flying applications such as toys, cost of materials is very critical. Unlike other micro helicopters, such as the FR-II of Seiko Epson, which uses gyro-sensor, current invention provides great flying stability without using gyro sensors, neither actuators nor tail rotor.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:

FIG. 1, 1A, 1B are simplified isometric views and a pictorial diagram illustrating a preferred embodiment of the present invention, including a counter-rotating Rotary-wing apparatus.

FIG. 3A, 3B, 3C are isometric views illustrating a preferred method of connecting rotor blades of a Rotary-wing apparatus.

FIG. 4A, 4B, 4C, 4D, 4E are exploded view of parts and assembly of upper rotor head showing a yaw trimming control knob for a collective pitch change of upper blades.

FIG. 6, 6A are isometric views and a pictorial diagram illustrating an auxiliary power system for driving Rotary-wing apparatus forward/backwards/yaw FIG. 8A, 8B, 8C are isometric views and a pictorial diagram illustrating Main drive system of a Rotary-wing vehicle.

FIG. 10A, 10B are diagrams illustrating swept forward blades of a Rotary-wing vehicle.

FIG. 12 is a simplified illustration of rotors and stabilizing apparatus.

FIG. 14A, 14B are isometric views illustrating Air breaks apparatus for a better Rotary-wing apparatus flying stabilization.

FIG. 18A, 18B are isometric views illustrating tail apparatuses and operation.

FIG. 20A, 20B are pictorial views illustrating toy helicopter and flying a toy helicopter of present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Reference is now made to FIGS. 1, 1A and 1B which are simplified pictorial diagrams illustrating one preferred embodiment of the present invention, a rotary-wing flying apparatus operating in plurality of applications. The illustrated embodiment of FIG. 1, 1A and 1B are presented in the context of flying toys, it is understood that this embodiment of the invention is not limited to toys and is equally applicable to other suitable types of small flying objects where cost, stability and ease of use are of importance.

FIG. 1 illustrates a front isometric view of a micro Rotary-wing apparatus 10 of a preferred embodiment of current invention.

A micro Rotary-wing apparatus 10 consists of two sets of counter rotating blades, a lower rotor blades system 200 and the upper rotor blades system 100.

A main coaxial drive shaft 300 provides a rotating power to said two sets of counter rotating blades 100, 200. A main coaxial drive shaft 300 consists of two parts: an outer main drive shaft 310 and an inner main drive shaft 312. Outer main drive shaft 310 provides a rotating power to the lower set of blades 200. Inner main drive shaft 312 provides a rotating power to the upper set of blades 100. The two parts of main coaxial drive shaft 300 rotate at the same speed and in opposite directions. While the outer main drive shaft 310 rotates in one direction, the inner main drive shaft 312 rotates in the opposite direction. A counter rotating movement of the two sets of blades the upper set 100 and lower set 200 cancel each others angular torque.

A lower rotor blades system 200 consists of two blades 202 and 204. The lower blades 202 and 204 are connected to the outer main coaxial drive shaft 310 using a rotor head 320.

An upper rotor blades system 100 consists of two blades 102 and 104. The upper blades 102 and 104 are connected to the inner main coaxial drive shaft 312 using a rotor head 350.

Stabilizing apparatuses are connected to each of the two counter rotating blades systems 100, 200. A Bell Stabilizing 207 apparatus is connected to the lower blade system 200. A Bell Stabilizing apparatus 107 is connected to the upper blade set 100.

The two blades systems 100 and 200 provide lifting force of the Rotary-wing apparatus 10.

A main drive power assembly 500 that is shown in FIG. 1A provides the rotating power to the two blades systems 100 and 200, through main coaxial drive shaft 300.

A main motor 501 provides rotating power through a main gear system 530 to main coaxial drive shaft 300. A counter rotating power is provided by main gear system 530 to the main coaxial drive shaft 300. The inner drive shaft 312 is powered in one direction while the outer drive shaft 310 is power in the opposite direction.

An auxiliary motors system 400 of a preferred embodiment of current invention consists of two sets of power assemblies, a left propeller system 410 and a right propeller system 440. An auxiliary left and right propellers system 410 and 440 provide forward, backwards and yaw movements of Rotary-wing apparatus 10 of a preferred embodiment of current invention.

It is yet another preferred embodiment of current invention that the propellers of auxiliary motors system 400 are located above center of gravity of Rotary-wing apparatus 10.

A control unit 700 controls the operation of Rotary-wing vehicle 10. A control unit 700 controls the operation of main drive power assembly 500 and the operation of auxiliary motors system 400. A control assembly 700 may also have remote control capabilities and may also have processing unit and memory. A control assembly 700 may also consist of a receiver for receiving remote control commands. Such a receiver may be of radio frequency (RF), light such as infrared (IR), or sound such as Ultra sound, or voice commands. A control assembly 700 may also consists of a pre programmed flying control, or programmable flying control to be programmed by the user.

A power assembly 600 provides power to all Rotary-wing apparatus 10 driving and control units: main drive power assembly 500, auxiliary motors system 400 and control unit 700. A power assembly 600 may be such as a rechargeable battery, simple battery, capacitance device, super capacitor, micro power capsule, fuel cells, fuel or other micro power sources.

A remote control unit 900 may preferably be used by an Operator to control Rotary-wing vehicle 10 of current invention. A remote control unit 900 has throttle control 908, which is preferably proportional control for controlling the power of the main drive assembly 500, A left/right 904 and forward backwards control 906 for controlling the power and rotation direction of the Auxiliary motors system 400. Control for left/right and forward/reveres may be of proportional type or non-proportional type. The A remote control unit 900 may also have a power switch 902, an indicator 920 for various inactions such as power on/off, charging, battery status, etc. It may have a waves radiation transducer 960 such as RF antenna as shown in case RF is used for transmission of remote control commands. It may also have a charger output 950 for charging the power assembly 600 of micro Rotary-wing apparatus 10.

Skids 800, 810 may be attached to micro Rotary-wing vehicle 10 to enable it to land of various surfaces such as solid and liquid materials. The skids 800, 810 can be in various shapes and materials such as foam and or plastic. They are connected to the main body of Rotary-wing vehicle 10 preferably be with a springy structure such as the bars 802, 804.

A canopy 12 as shown in FIG. 1 may cover internal parts of the Rotary-wing apparatus 10. A preferred main body structure of the micro Rotary-wing vehicle 10 is using a light martial for a canopy 12. An alternative main body structure would be using foam structure 12, which would provide compelling look of the Rotary-wing apparatus 10. The Cover 12 would preferably cover internal components of Rotary-wing apparatus 10 such as main driving assembly 500.

In another preferred embodiment of current invention, a Rotary-wing apparatus 10 that may also consists of a tail 900 for an improved directional stability.

In yet another preferred embodiment of current invention a Rotary-wing apparatus 10 that may also consists of air break 850 that is preferably located below center of gravity of Rotary-wing apparatus 10.

FIG. 1B, is a pictorial view of a front isometric view of a Rotary-wing apparatus 10 of a preferred embodiment of current invention, which is given for even better clarification.

Reference now is made to FIGS. 3A, 3B, 3C which provide illustrations of one preferred method for connecting rotor blades 202 and 204 of lower blade assembly 200 of a Rotary-wing apparatus 10. In FIG. 3A, a blade connector 203 is put aligned with a locking pivot 224 of blades assembly 200. Arrow 940 shows the direction of inserting a slot 205 of blade connector 203 onto locking pivot 224.

Reference is now made to FIG. 3B, a blade connector 203 is assembled onto blade locking pivot 224 of rotor lower head hub 212 of lower rotor head 320. Blade 202 is now pulled away as shown by arrow 942 from the rotor assembly 212 so spring 234 now pushes blade connector 203 and causing a blade 202 to be held onto the locking pivot 224. Arrow 944 shows the direction the operator needs to rotate blade 202, so blade connector 203 will be locked into its fix position with rotor lower head hub 212 of rotor head 320.

Blade 202 is now manually rotated against spring 234, as shown by Arrow 944. Spring 234 slides over the blade connector 203 using the blade locking pivot 212 as its axis for rotation. Reference is now made to FIG. 3C where blade 102 is now in its “ready to fly” position. Positioning slot 140 of blade connector is held clicked in its position by Pin 225 of and slot 240 and by force of spring 134. Locking other blades 204, 102 and 104 is implemented in a similar manner.

It will be appreciated that blades assembly apparatuses 100 and 200 of current invention provides an innovative method that is simple to assemble and to replace blades even by a layman in the art of flying machines. Should a low external force is applied on blades 102, 104, 202, 204, the blades will be swept back. By folding back a possible damage is avoided to an external object, or operator, which blades may hit. It would be appreciated that current invention method and mechanism of blades with folding capabilities, provide a high safety method and mechanism, so the probability of an operator of Rotary-wing apparatus 10 of current invention to be damaged by hitting the rotors is significantly lower. It would further be appreciated that a preferred rotor blades folding method of current invention also reduces probabilities for damaging blades 100, 200 themselves by hitting external object.

It would be appreciated that in order to increase safety of Rotary-wing vehicle 10 operator and other objects in the surroundings of Rotary-wing vehicle 10, blades 102, 104, 202, 204 will preferably be made from a soft and foldable material such as foam, flexible plastic materials, foils, or other soft, and flexible materials and that are strong enough to provide lifting power.

Another preferred embodiment of current invention is a control unit 700 of FIG. 1A that may also consists of means of detecting collision conditions. In case of a collision of blades 100, 200 with external objects, control unit 700 may detect the situation and stop rotors rotation power. Such collision detection may be implemented by measuring of a sudden increase of main motor 500 current, which is a result of an external force rather than a result of a user command for increasing throttle.

It would be appreciated that method of connecting blades 100, 200 of current invention enables fast and easy connection and disconnection of a rotor blades 100, 200 from the rotor heads 320, 350 without fasteners and tools.

It would also be appreciated that the rotor blades are click-able into their position and therefore no further adjustments are needed. Another preferred embodiment of current invention is using the same spring that holds the blade in its position so that it will not fold while the rotor accelerates, to enable blade folding in case said blade hits an external obstacle and provides additional safety.

It will be further appreciated that present invention includes variations and modifications, which would function as fast connection of blades 100, 200 without the need of tools and a fast swept back or blades disconnection due to operation of external force.

Reference is now made to FIG. 4A, which is an exploded view of parts and assembly of upper rotor head 350. A yaw trimming control knob 964 enables a collective pitch change of upper blades 102, 104. Yaw trimming control knob 964 may have an internal thread. It can manually turned by operator of Rotary-wing apparatus 10. Turning Yaw trimming control knob 964 clockwise over contra bolt 654, pushes collective control horn 960 downwards. Control horn 960 is connected to rotor head hub 930 using connecting pins 962, 964. Consequently rotor head hub 930 is twisted. As a result the pitch of Rotor blades 102 and 104, which are connected to rotor head hub 930, are increased collectively.

Rotor head hub 930 is of a “rigid” type therefore it cannot titter; as a result pitch axis of Rotor head hub 930 axis is always kept perpendicular to main drive shaft 300, enabling rotor forces to be transferred to main drive shaft 300. Rotor head hub 930 can freely rotate around pitch axis 952, enabling Bell assembly 107 to stabilize Rotary-wing apparatus 10.

Similarly turning Yaw trimming control knob 964 counterclockwise over contra bolt 654, pulls collective control horn 960 upwards thus reducing pitch angles of Rotor blades 102 and 104.

Upper rotor 100 rotates counterclockwise. By turning Yaw trimming control knob 964 clockwise, the increased pitch of Upper rotor blades 100 increases the moment that is transferred to the rotor hub 930 of upper rotor head 350. The increased moment causes Rotary-wing apparatus 10 to yaw clockwise. As a result, turning Yaw trimming control knob 964 clockwise causes Rotary-wing apparatus 10 to yaw clockwise.

The above-described yaw trimming method of present invention enables an operator of Rotary-wing apparatus 10 to prevent undesired yaw movements of Rotary-wing apparatus, 10 while auxiliary motors 400 of FIG. 1 are inactive.

FIG. 4B, is a pictorial view of an exploded view of parts and assembly of upper rotor head 350, which is given for even better clarification.

Reference is now made to FIG. 4C, which is an illustration of Rotor head hub 930 of rotor head 350 of FIG. 4A. Rotor head hub 930 consists of locking springs 932,934 that hold blades 102, 104 at the correct position; Pitch control horn 940,942 for receiving force of collective control horn 960 of FIG. 4A; Flexible strips 936, 938, which carry centrifugal forces of blades 102, 104 and also enables the change of angle between blades 102, 104. Rotor head hub 930 can freely pivot around pitch axis 952 of FIG. 4A that is inserted though holes 948 of Rotor head hub 930.

Reference is now made to FIG. 4D, which is an illustration of a partially assembled upper rotor head 350 and where contra bolt 654 can clearly be seen.

Reference is now made to FIG. 4E, which is an illustration of a complete assembly of upper rotor head 350 and where yaw trimming control knob 964, which enables a collective pitch change of upper blades 102, 104 is located at the top of upper rotor head 350.

Reference is now made to FIGS. 6, 6A, which describes yet another embodiment of current invention, an auxiliary power system 400 consists of a left power assembly 410 and a right power assembly 440. Each consists of a propeller and motor. Left power assembly 410 consists of a motor 412, propeller 414 and protecting shield 416. Right power assembly 440 consists of a motor 442, propeller 418 and protecting shield 450. Propellers 414, 418 provide air thrust in a desired direction when spinning. Propellers 414, 418 can be rotated clockwise and anticlockwise independently and according to commands received from control assembly 700.

Propellers 414, 418 are used to move Rotary-wing apparatus 10 forward, backwards and in yaw (rotate horizontally clockwise or counterclockwise) movements. Auxiliary Motors 412, 442 provide the rotation power of auxiliary Propellers 414, 418. Protective shields 410, 450 are used for protecting Propellers 414, 418 and Auxiliary Motors 412, 442 against external damage and for safety reasons. Auxiliary Motors 412, 442 are connected to the main Rotary-wing vehicle's frame by means of flexible connecting rods 420.

Another preferred embodiment of current invention are Auxiliary power systems 412, 442 that are located above gravity center of Rotary-wing vehicle 10 providing a correct pitching moment in addition to providing direct vector thrusts for directional control. It would be appreciated that preferred position of Auxiliary power systems 412, 442 contributes to aeronautical stability of Rotary-wing vehicle 10. Control unit 700 of FIG. 1A controls the Auxiliary Motors 412, 442 movements.

FIG. 6A, is a pictorial view of auxiliary power system 400 that is given for even better clarification.

Reference is now made to FIGS. 8A, 8B, 8C, which describe main drive system 500 of Rotary-wing vehicle 10. Main Rotary-wing vehicle drive system 500 consists of at least one driving motor 501 connected to a main gear system 530. A main gear system 530 is also connected to main rotors drive shafts 300 of FIG. 8A and of FIG. 1A. A main gear system 530 consists of primary reduction gears 502, 504 and a counter rotating gears arrangement 511 consists of gears 510, 512, 514 that are powered from primary reduction gears 502, 504 via an auxiliary drive shaft 508. Gear 514 provides rotating power through drive shaft 312 in one rotating direction while gear 512 rotates drive shaft 310 at the same angular velocity and with an opposite direction. It would appreciated that this embodiment of current invention of using a gearbox 530 to counter rotate coaxial main drive shafts 300, rotate upper and lower rotor assemblies 100, 200 at same angular speed regardless of motor power. Consequently yaw of Rotary-wing apparatus 10 of current invention is not affected by changes in power of main motor 501. It would also be appreciated that by using the above-described embodiment of current invention there is no need for additional active yaw stabilization means. No additional active stabilization means such as gyro sensors, servo systems, or additional motors enables reducing the cost of producing a Rotary-wing vehicle 10 to consumer products cost level such as toys costs. As explained in FIGS. 4A,B,C,D,E a simple one-control knob 964, which is yet another embodiment of current invention enables tuning of a possible drifting yaw movement due to a residual difference in angular torque of upper and lower rotors systems 100 and 200. A power source tray 604 is connected to a Rotary-wing vehicle 10 via a flexible structure 606. A power source 600 is held within the power source tray 604. A power source 600 is preferably be rechargeable battery, or may also be a battery, a capacitor, a supper capacitor, a fuel cell, small fuel engine, and other small-condensed power sources.

FIG. 8B, is a pictorial isometric color view of main drive system 500 of Rotary-wing vehicle 10 that is given for even better clarification.

Referring now to FIG. 8C, which show yet another embodiment of current invention, a method and system for controlling forward motion of a Rotary-wing vehicle 10 of current invention when power is not applied to auxiliary power system 400 of FIG. 1. In accordance with current invention, an ability to move the power source assembly 604 back and forth by simple mechanical means in order to change flight characteristics. A center of gravity of Rotary-wing vehicle 10 of current invention can be adjusted in line with main rotor drive shaft 300 for enable Rotary-wing vehicle 10 to hover steadily when power is not applied to auxiliary power system 400 of FIG. 1.

Alternatively by moving power source assembly 604 forward, center of gravity of Rotary-wing vehicle 10 may be adjusted ahead of main rotor drive shaft 300 central line. In such case Rotary-wing vehicle 10 will have a slow forward flight when auxiliary power 400 of FIG. 1 is not operating.

By moving power source assembly 604 even further forward, Center of gravity can be adjusted further ahead of main rotor drive shaft 300 central line, resulting in a faster forward flight when no power is applied to auxiliary power 400 thus with less energy power consumption. Adjusting a simple knob 610 by displacement mechanisms such as a screw mechanism 608 controls center of gravity Backwards/forwards related to main rotor drive shaft 300 central line. Alternatively a sliding apparatus may be used for center of gravity location control.

Reference is now made to FIGS. 10A, 10B, which are illustrations of yet another preferred embodiment of current invention. FIG. 10A is an upper view of blades 202 and 204. One preferred embodiments of current invention are main rotor blades 202 and 204 (and similarly main rotor blades 102, 104 of FIG. 1) with a lifting force center 920, which is located ahead of pitch axis 914. FIG. 10 shows one such preferred implementation, where blades set 202, 204 are swept forward.

It would be appreciated that by implementing forward swept blades of current invention, the advancing blade lift 924 creates a blade pitching moment around the pitch axis which is opposite of blade pitching moment 922 of FIG. 10B therefore, the net pitching moment of the blades around the rotor head pitch axes is zeroed or positive with respect to the direction of flight. Positive moment in that case means a moment that attempt to tilt back the rotor head when the pitch axes is perpendicular to the direction of flight. This pitch moment affects the fly bar 207 plan of rotation in a desired manner and improves flight stability.

At any wind speed 928 other than zero (hovering) the pitching moment of the advancing and retarding blades does not cancel each other. If the blades are not swept forward and have their lift center aligned with the pitch axis then the increased pitching moment of the advancing blade sums up with the decreased pitching moment of the retarding blade will cause such a net pitching moment on the rotor head that will attempt to tilt the fly bar forward into the wind. As a result, acceleration and diverging into a crash may occur. It would be appreciated that with forward swept blades of present invention, net pitch moments 930 that affect the fly bar may be zeroed, or even in the opposite direction, thus it is possible to eliminate that phenomena. The lift vector of such blades, being aft of the pitch axis, will provide a pitching moment in an opposite direction to the blade natural pitching moment and cancel the effect. The correct forward swept angle for smooth and stable flying may be determined according to the specific blade shape and blades set arrangement.

A forward swept blade has also an imaginary axis which acts as a delta hinge, which reduces the blade pitch when it flaps up, thus adds to the overall stability.

Reference is now made to FIGS. 12, which is an illustration of yet another preferred embodiment of current invention. Upper rotor blades set 100, and lower rotor blades sets 200, which are designed to be different from each other. The two different designs are meant to create different conning angle between the upper and lower rotor blades while flying. It is yet another embodiment of current invention that a difference in upper 100 and lower 200 rotor blades may be in their geometry and shape design such different blade profile, or twist, mass of the blades, blades material type, blades outline shape, different blades speed, and/or any combination of the above options.

The different coning angles combine with the forward swept blades and rigid rotor heads gives a pendulum free flight characteristics

Reference is now made to FIGS. 14A, 14B, which, shows another method for improving flight quality of yet another embodiment of current Rotary-wing vehicle 10 invention. Air breaks 850 are positioned below the Center of Gravity (CG) of Rotary-wing vehicle 10 creates a down pitching moment. With proper selection of the break size and distance from CG it is possible to achieve an almost level flight at a speed range of Rotary-wing vehicle 10 of present invention.

It would be appreciated that adding “pitch up resistance brakes” 850 to a Rotary-wing vehicle 10 enables a much smoother flight, and minimizing swinging due to pitch up that may be created by the forward movement of the Rotary-wing vehicle 10. Pitch up resistance breaks 851, 852 function as air brakes air brakes 850 of present invention are located below center of gravity (CG) of Rotary-wing vehicle 10. Preferably air brakes 850 may be added at the lowest possible place to achieve maximum pitching down moment as speed increases. Such location may be at skids 800. As a result, while the main rotors 100, 200 pitch up as speed is picking up, the air brakes 850 keep the rest of the Rotary-wing vehicle 10 level or at just a slight pitch up angle. With proper selection of pitch resistance brakes size, a smooth and constant forward speed may be achieved at much higher speeds then without them. Air brakes 850 may be connected by a fixed or dynamic connection.

Reference is now made to FIGS. 18A, which, shows another method for improving flight quality of yet another embodiment of present Rotary-wing vehicle invention, a method for yaw damping that can be used with Rotary-wing vehicle 10 of present invention by the use of a fixed tail fin 870 (fixed rudder). Fixed tail fin 870 also creates a “windmill” effect, which will point the Rotary-wing vehicle 10 nose 871 onto the flying direction while reducing possibility of flying sideway.

It is yet another embodiment of present invention, dynamic air brakes 851, 852 which are used for steering left/right of Rotary-wing vehicle 10. Actuators 860, 862, such as solenoids can change air brakes 851, 852 position to increase/decrease the air resistance changing flight direction. It would be appreciated that using this steering method Rotary-wing vehicle 10 may use only one auxiliary motor. An auxiliary forward/backwards motor will be centered aligned with the main rotor coaxial shaft as shown in FIG. 18B.

Reference is now made to FIGS. 18B, which, shows yet another innovative method for steering left/right the Rotary-wing vehicle 10 of current invention. An actuator 882 controls a steering tail 880. Operator may control the steering tail by controlling the steering actuator 882.

Reference is now made to FIGS. 20A and 20B, which show pictures of one preferred Rotary-wing apparatus 10 of current invention, a micro coaxial helicopter toy.

FIG. 20A is a picture of one possible design of Rotary-wing vehicle 10 of current invention. Its body 12 is made of foam, or possibly has a low weight canopy made of thin lightweight plastic, or cardboard. Skids 800 are made from foam, or other lightweight materials and rotor blades 100, 200 are made of foam and or cardboard, or other lightweight and flexible materials.

Reference is now made to FIG. 20B showing a picture of a typical flying operation of current invention. Rotary-wing apparatus 10 may be control by a remote controller 900, such as RF remote control unit; alternatively Infra-Red (IR), or Sound control, such as ultra sound remote controllers, may control it. It may also program to operate with no remote controls.

It is appreciated that Rotary-wing vehicle embodiments of the present invention are typically capable of stable flying forward backwards and perform clockwise and counterclockwise yaw maneuvers. It is further appreciated that elimination of a need for movement and acceleration sensors reduces the cost of Rotary-wing vehicle and make it affordable for consumer products such as toys.

It is further appreciated that said Rotary-wing vehicle counter rotating blades provide inherent aeronautical stability. Its intuitive flying control enables a layman user to fly a low cost Rotary-wing vehicle with very minimal training.

It is further appreciated that said Rotary-wing vehicle is design for safe use even in doors. Said Rotary-wing vehicle is made of elastic materials; main rotor blades are flexible and folded back in case of encountering an external force; Low power motors are used; Motors may halt on detection of external force.

It is further appreciated that said Rotary-wing vehicle requires minimal, or no adjustments. Should a yaw or hovering tuning is required, a simple manual adjustment is made possible by simple means such as single knob.

It is further appreciated that differential “tank-like” steering of said Rotary-wing vehicle is very convenient, provides good yaw control, as well as forward/backwards control of said Rotary-wing vehicle flight maneuvers.

It is further appreciated that using same power source for rotating counter-rotating blades of said Rotary-wing vehicle eliminates possible drifts in blades behavior over time, such as when two different power sources are used for rotating said counter-rotating blades. Consequently yaw stability over time is significantly better.

It is further appreciated that elimination of dynamic main blades pitch control such as actuators, such as used with common helicopter, significantly simplifies said Rotary-wing vehicle design, reduces its cost, and make it more robust and reliable.

It is further appreciated that elimination of a tail propeller such as used with common helicopter, simplifies said Rotary-wing vehicle design, reduces cost, and increases reliability, stability and maneuverability.

It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the scope of the present invention includes both combinations and sub combinations of the various features described hereinabove as well as variations and modifications which would occur to persons skilled in the art upon reading the specification and which are not in the prior art. 

1. A coaxial Rotary-wing apparatus with at least two sets of counter rotating lifting blades, wherein said two sets of counter rotating lifting blades have same angular velocity with opposite directions, wherein said two sets of counter rotating lifting blades are located one above the other and wherein center of gravity of said coaxial Rotary-wing apparatus is positioned lower than said two sets of counter rotating lifting blades and wherein said coaxial Rotary-wing apparatus also comprising of: Main power means, which drive said two sets of counter rotating lifting blades; Auxiliary power means, which enable flying said coaxial Rotary-wing apparatus in at least following directions: forwards, backwards, perform yawing; Power control means for controlling the power applied to said two sets of counter rotating lifting blades and to said auxiliary power means.
 2. A coaxial Rotary-wing apparatus as in claim 1 wherein there is no other external real-time control of said two sets of said counter rotating lifting blades other than their velocity control.
 3. A coaxial Rotary-wing apparatus as in claim 1 wherein said Auxiliary power means are plurality of propellers that are located on opposite sides of said coaxial Rotary-wing apparatus and wherein said propellers face the direction of flight and wherein said propellers are located above the center of gravity of said coaxial Rotary-wing apparatus.
 4. A coaxial Rotary-wing apparatus as in claim 3 wherein Bell-stabilizing means is connected to each of said sets of counter rotating lifting blades.
 5. A coaxial Rotary-wing apparatus as in claim 4 wherein each of the sets of counter rotating lifting blades is connected to a main driving shaft using “rigid head” and wherein said “rigid head” enables pitch movements only.
 6. A coaxial Rotary-wing apparatus as in claim 4 wherein lifting power center of said rotating lifting blades is located forward of the axis of the head which connects said blades to said driving main shaft.
 7. A coaxial Rotary-wing apparatus as in claim 6 wherein said rotating lifting blades are swept forward.
 8. A coaxial Rotary-wing apparatus as in claim 2 wherein the upper set of rotating lifting blades are different from the lower set of rotating lifting blades.
 9. A coaxial Rotary-wing apparatus as in claim 8 wherein the upper set of rotating lifting blades differ from the lower set by at least one of the followings: type of material, shape.
 10. A coaxial Rotary-wing apparatus as in claims 2 and wherein its aeronautical stability is also in accordance to a combination of claims: 4, 5, 7,
 8. 11. A coaxial Rotary-wing apparatus as in claims 10 and wherein coaxial Rotary-wing apparatus is a flying toy.
 12. A coaxial Rotary-wing apparatus as in claim 4 that also consist of air brakes means and wherein said air brakes means are located below center of gravity of said coaxial Rotary-wing apparatus.
 13. A coaxial Rotary-wing apparatus as in claim 4 that also consists of a tail fin, which provides an improved directional stability
 14. A coaxial Rotary-wing apparatus as in claim 4 and wherein a single manual yaw tuning means is connected to one of said set of blades and wherein said tuning means adjusts collective pitch of said blades.
 15. A method for controlling the flight direction of a flying Rotary-wing toy using differential trust wherein said differential trust at least provide trust vectors associated with the flight plan and wherein said differential trust is located above center of gravity of flying Rotary-wing toy.
 16. A coaxial Rotary-wing toy as in claims 11 and wherein flight of flying Rotary-wing toy is remotely controlled.
 17. A method for connecting and disconnecting wings of a flying toy to a correct position using fast connection means, which does not require tools and wherein an external excessive force when applied to said blades will cause said blades to swept back, or disconnect.
 18. A method as in claim 17 and wherein said flying toy is a Rotary-wing apparatus
 19. A coaxial Rotary-wing apparatus as in claim 2 wherein said Auxiliary power means is a single propeller facing direction of flight and wherein said single propeller controls forward and backwards movements of said Rotary-wing apparatus and wherein air-resistance means controls the yaw movements of said Rotary-wing apparatus.
 20. A coaxial Rotary-wing apparatus as in claim 2 and wherein said coaxial Rotary-wing apparatus also comprising of manual-tuning means for forward/backwards position adjustment of center of gravity of said Rotary-wing apparatus. 